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 TM5-4120-384-14
The compressor and motor assembly are hermetically sealed in a
The crankcase heater element, heater thermostat,
metal canister.
related parts, and the electrical connector are attached to the
canister externally.
The compressor is located in the rear
(compressor/condenser) compartment. (See fig. 5-21.)
Disconnect input power to the air conditioner before
performing any maintenance to the electrical system.
Voltages used can be lethal.
a.
Inspect/Test.
Electrically test heater element,
heater
thermostat, wiring harness, and motor as follows:
(1)
Disconnect
input
power
at
its
source.
(2) (Models F18H-3S and F18H-1S) Remove all three top covers
(Models F18H-3SA and F18H-3SB) Remove top cover (para
(3) Disconnect wiring harness by
removing
P10
from
J10
(located on compressor junction box).
(4)
Remove
compressor
junction
box
cover.
(5) Inspect internal wiring in compressor
junction
box
to
ensure no wires are broken or grounded.
(6) Use a continuity tester or multimeter set on lowest OHMS
scale to check for continuity between pins G and F in connector
J10.
If there is no continuity between these pins, heater or
thermostatic switch is bad and should be replaced. Continue
testing to isolate defective component.
(7) In the compressor junction box disconnect thermostat
switch lead from crankcase heater lead.
Check continuity between
pin G and thermostat switch lead.
If continuity is not indicated
switch is defective.
(8) Check continuity at heater
lead and pin F. If continuity
is
not indicated, heater is defective
and should be replaced.
(9) Check continuity between pins D and E, if there is no
continuity between these pins and the compressor has had time to
cool down, the compressor motor internal overload switch (S8) is
bad and compressor must be replaced.
5-73
Change 2
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